Liquefier



Dec. 27, 1938.

A T. THOMPSON LIQUEFIER Filed July 15, 1937 JZZerZZ'FZmpsan Patented Dec. 27, 1938 UNITED STATES PATENT OFFICE 1 LIQUEFIER Albert 'r. Thompson, New orleans, La. Application July 13, 1937, Serial No. 153,452

2 Claims.

opening for closing the same and a member threaded on the liquefier and having a portion extending through the opening and cooperating with the closure for forcing the closure into closed position when the member is rotated.

A further object is to provide the member threaded on the liquefier with a threaded extension extending into a threaded recess in the cover for forcing the cover outwardly and to closed 20 position when the member is rotated.

v A further objectis to provide the cover plate with a flared opening, in which the threaded member is received, and the cover guided to proper registration as the threaded member is rotated.

. 25 A further object is to provide the threaded member extending through the fillingopening with a cap shaped member threaded on the outer periphery of the receptacle for drawing the cover plate closed, and for forming adouble seal.

I 30 A further object is to provide the cover recess and threaded studwith thread of greater pitch than the thread carried by the member on which the stud is mounted, thereby insuring a seating of the cover on the gasket when the threaded mem- 35 ber is rotated and the cap carried thereby.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being 40- understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawingz- Figure is a view similar to Figure l, but show- 55 ing amodified form of structure.

Figure 1 is a viewin elevation of the liquefler.

Figure 6 is a horizontal sectional view-taken on line 6-6 of Figure 5.

Figure '7 is a horizontal sectional view taken on line l'l of Figure 5.

Referring to the drawing, the numeral I desig- 5 nates the liquefier receptacle, which is preferably cylindrically shaped as shown and provided at its upper end with a conventional form of discharge valve 2', so the device can be attached to piping means for conveying the gas to various points of use, for instance to a soda fountain. The lower end of the receptacle l is provided with an axially disposed filling opening 3, through which solid carbon dioxide is passed, and at which time the device is preferably inverted with the captive 010- sure plate 4 suspended therein. The closure plate- 4 is anchored to the inner wall of .the receptacle I by means'of a chain 5. After the solid carbon dioxide is placed within the chamber of the receptacle I, the device is then placed in a vertical position so the closure plate 4 will rest on the gasket 6 and form a closure for the filling opening 3. As the carbon dioxide sublimes and gasifies, it creates a pressure which will force the cover plate into 'close binding engagement with the gasket 6, however to prevent any leakage during handling and to insure a close leakprooi connection, a cap I is provided which is threaded at 8 on the outer periphery of the receptacle l. Cap 8 is also provided with a threaded lug 9, which extends an axially through the fllling opening 3, thence through the flared outer end [0 of the threaded aperture ll.

Threaded aperture II is axially disposed within the cover plate .4 and in the boss l2 carried 5 thereby and has its threads at a greater pitch than the threads 8, therefore it will be seen that as the threaded bushing l is threaded onto the outer periphery of the receptacle l, the cover plate 4 will move at a rate greater than the move- 40 ment of the bushing 1, thereby insuring a seating of the cover plate on the gasket 6 with an increasing pressure. Bushing I is provided with spanner wrench receiving apertures l3, so the bushing'can beeasily rotated for closing the de- 4' vice or for refilling. The bushing 1 not only forms a positive closing means in connection with the closure plate 4, but also prevents dam-- age to the parts as the device is handled and shipped.

Referring to the modified form shown in Figures 5, 6 and 7, the structure is the same excepting instead of using a cap 'I, a threadeddisc la is provided which is threaded at I4 into the filling opening 3; The same numerals apply to the modified form.

From the above it will be seen that a liquefier is provided which is particularly adapted for use in connection with expanding gases, for instance carbon dioxide and that the closure plate is not only held closed by pressure generated within the receptacle, but also by a threaded member having threaded engagement with. the receptacle. It will also be seen that by providing the flared end I0 to the threaded aperture II, that upon the initial closing operation the cover plate 4 will be properly centered axially in relation to the filling opening 2, and the threaded lug 9 will be guided to proper axial position to thread into the threaded aperture l I, as it is rotated.

The invention having been set forth what is claimed as new and useful is:

1. The combination with a liquefier closure plate disposed within a receptacle end and cooperating with a filling opening in said end, of means for moving said closure plate towards closed position, said means comprising a cap threaded on the receptacle end, a threaded extension carried by the cap and extending axially through the filling opening and threaded into the cover plate, the thread of said cap and extension in the cover plate being of a pitch whereby when the cap is rotated the cover plate will be moved to closed position at a greater rate of speed than the cap for insuring a rapid seating of the cover plate.

2. The combination with a cover plate disposed within a liquefier and cooperating with a filling opening, of a threaded plate threaded in the filling opening, said threaded plate having a threaded extension threaded into the cover plate at a pitch greater than the pitch of the threaded plate whereby when the threaded plate is rotated the cover plate will be axially moved at a speed greater than the speed of movement of the threaded plate, thereby insuring a seating of the cover plate.

ALBERT T. THOMPSON. 

